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be74f71a67
Correct Sphinx style comments in include/dm/ofnode.h and add the device tree node API to the HTML documentation; the ofnode functions are compatible with Live tree or with flat device tree. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Taken from Linux v4.9 drivers/of/address.c
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*
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* Modified for U-Boot
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* Copyright (c) 2017 Google, Inc
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*/
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#ifndef _DM_OF_ADDR_H
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#define _DM_OF_ADDR_H
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/**
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* of_translate_address() - translate a device-tree address to a CPU address
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*
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* Translate an address from the device-tree into a CPU physical address,
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* this walks up the tree and applies the various bus mappings on the way.
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*
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* Note: We consider that crossing any level with #size-cells == 0 to mean
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* that translation is impossible (that is we are not dealing with a value
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* that can be mapped to a cpu physical address). This is not really specified
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* that way, but this is traditionally the way IBM at least do things
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*
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* @np: pointer to node to check
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* @in_addr: pointer to input address
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* Return: translated address or OF_BAD_ADDR on error
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*/
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u64 of_translate_address(const struct device_node *np, const __be32 *in_addr);
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/**
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* of_translate_dma_address() - translate a device-tree DMA address to a CPU
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* address
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*
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* Translate a DMA address from the device-tree into a CPU physical address,
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* this walks up the tree and applies the various bus mappings on the way.
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*
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* Note: We consider that crossing any level with #size-cells == 0 to mean
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* that translation is impossible (that is we are not dealing with a value
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* that can be mapped to a cpu physical address). This is not really specified
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* that way, but this is traditionally the way IBM at least do things
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*
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* @np: ne
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* @in_addr: pointer to input DMA address
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* Return: translated DMA address or OF_BAD_ADDR on error
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*/
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u64 of_translate_dma_address(const struct device_node *np, const __be32 *in_addr);
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/**
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* of_get_dma_range() - get dma-ranges for a specific DT node
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*
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* Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
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* cpu->bus address translations
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*
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* @np: Pointer to device tree blob
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* @cpu: Pointer to variable storing the range's cpu address
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* @bus: Pointer to variable storing the range's bus address
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* @size: Pointer to variable storing the range's size
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* Return: translated DMA address or OF_BAD_ADDR on error
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*/
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int of_get_dma_range(const struct device_node *np, phys_addr_t *cpu,
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dma_addr_t *bus, u64 *size);
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/**
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* of_get_address() - obtain an address from a node
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*
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* Extract an address from a node, returns the region size and the address
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* space flags too. The PCI version uses a BAR number instead of an absolute
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* index.
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*
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* @np: Node to check
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* @index: Index of address to read (0 = first)
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* @size: place to put size on success
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* @flags: place to put flags on success
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* Return: pointer to address which can be read
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*/
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const __be32 *of_get_address(const struct device_node *np, int index,
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u64 *size, unsigned int *flags);
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struct resource;
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/**
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* of_address_to_resource() - translate device tree address to resource
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*
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* Note that if your address is a PIO address, the conversion will fail if
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* the physical address can't be internally converted to an IO token with
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* pci_address_to_pio(), that is because it's either called to early or it
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* can't be matched to any host bridge IO space
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*
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* @np: node to check
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* @index: index of address to read (0 = first)
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* @r: place to put resource information
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* Return: 0 if OK, -ve on error
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*/
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int of_address_to_resource(const struct device_node *np, int index,
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struct resource *r);
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#endif
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